/*
because dot uses strtok() to parse strings
it does not detect unusual strings or empty
strings like:
style=",,,,,,";
when expected something like:
style="invis,dotted";

It is easy to fix to have a warning on such strings
Here is a test:
*/
digraph "strtok"
{
 style=",,,,,,,,,,,,,,,,";
 "a";
}

